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Data processing method for measuring prompt neutron attenuation parameters for a reactor

A technology of prompt neutron and attenuation parameters, which is applied in the field of measurement of dynamic characteristic parameters of zero-power reactor physical tests, to achieve the effect of avoiding prompt critical accidents and ensuring safety and reliability of prompt neutron attenuation parameters

Active Publication Date: 2017-05-31
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to obtain effective and reliable prompt neutron attenuation parameters. The problem

Method used

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  • Data processing method for measuring prompt neutron attenuation parameters for a reactor
  • Data processing method for measuring prompt neutron attenuation parameters for a reactor
  • Data processing method for measuring prompt neutron attenuation parameters for a reactor

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Embodiment

[0041] Such as Figure 1 to Figure 2 Shown, a kind of reactor of the present invention measures the data processing method of prompt neutron attenuation parameter, comprises the following steps,

[0042] Step 1: Determine the prompt neutron attenuation parameter α to participate in the fitting i The data point n;

[0043] Step 2: Determine the control rod used for the calibration. The scale is represented by H, and the unit is cm. According to the rod lifting procedure, lift the control rod to the top, and keep the peripheral control rods fixed after leveling, and then divide the control rods into n steps. Insert evenly to the bottom, insert one H each time i The stick position measures a corresponding α i Value, n is a natural number greater than zero;

[0044] Step 3: Whenever the control stick is inserted down to H i When the rod is in position, according to the estimated α i The value adjusts the emission frequency of pulsed neutrons, so that within a pulse period, t...

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Abstract

The invention discloses a data processing method for measuring prompt neutron attenuation parameters for a reactor. The method includes the alpha reactivity measurement principle that rho equals to (alpha-alpha 0) / alpha 0, wherein alpha and alpha 0 are the prompt neutron attenuation parameters, the unit of the parameters is s-1, rho is reactivity, and the unit of the reactivity is beta eff. The invention further includes the following steps that firstly, a data point n of the prompt neutron attenuation parameter alpha i taking participation in fitting is determined; secondly, a control rod for scaling is determined, the scale is represented by H, the unit is centimeter, the control rod is lifted to the top according to a rod lifting program, the control rod on the periphery is kept static after critical leveling, then the control rod is evenly inserted to the bottom in n steps, and one corresponding alpha i value is obtained each time the control rod is inserted by one Hi rod position, wherein n is a natural number larger than zero; thirdly, each time the control rod is inserted to the Hi rod position, the emission frequency of pulse neutrons is adjusted according to the estimated alpha i values, so that in one pulse period, attenuation of the prompt neutrons is right completed, delayed neutrons are close to the bottom, and one alpha i value is obtained by means of a measurement curve according to least squares fitting.

Description

technical field [0001] The invention relates to the technical field of measuring dynamic characteristic parameters of a zero-power reactor physical test, in particular to a data processing method for measuring prompt neutron attenuation parameters of a reactor. Background technique [0002] In the research of zero-power physics experiments with uranium water as the medium, the reactor usually operates in the delayed criticality state, and the prompt neutrons play a leading role in the attenuation of the secondary neutrons. Prompt neutron decay is represented by the characteristic time parameter α, which is a characterization of the probability of prompt neutron decay per unit time. The deeper the subcriticality is, the larger the value of α is. For a specific reactor type, the Prompt neutron decay parameter α 0 is unique. Delayed critical prompt neutron attenuation parameter α 0 As a reference point, the prompt neutron attenuation parameter α in different subcritical stat...

Claims

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Application Information

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IPC IPC(8): G21C17/104
CPCG21C17/104Y02E30/30
Inventor 盘世标黄礼渊牛江付国恩杨永木阳林锋汪文聪
Owner NUCLEAR POWER INSTITUTE OF CHINA
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